<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<canvas id="canvas" style="border:1px solid #aaa; display: block; margin: 50px auto; "></canvas>
<script>
window.onload=function(){
var canvas=document.getElementById("canvas");
canvas.width=800;
canvas.height=800;
var context=canvas.getContext("2d");
context.beginPath();
context.moveTo(100,100);
context.lineTo(700,700);
context.lineTo(100,700);
context.closePath();
context.lineWidth=10;
context.fillStyle="red";
context.strokeStyle="#058";
context.stroke();
ontext.fill();
}
</script>
</body>
</html>
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